code: def fix_eols(s):
      """Replace all line-ending characters with \\r\\n."""
      # Fix newlines with no preceding carriage return
      s = re.sub(r"(?<!\r)\n", CRLF, s)
      # Fix carriage returns with no following newline
      s = re.sub(r"\r(?!\n)", CRLF, s)
      return s
  
imports: import os
  import re
  import time
  import base64
  import random
  import socket
  import urllib
  import warnings
  from email._parseaddr import quote
  from email._parseaddr import AddressList
  from email._parseaddr import mktime_tz
  from email._parseaddr import parsedate
  from email._parseaddr import parsedate_tz
  from quopri import decodestring
  from email.encoders import _bencode, _qencode
label_desc: Use image node_id 3 for calling a global function with example usage: fix_eols(s) and returns: s